CPU profiler: make code events handling scalable.

src/unbound-queue-inl.h

+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_UNBOUND_QUEUE_INL_H_
+#define V8_UNBOUND_QUEUE_INL_H_
+
+#include "unbound-queue.h"
+
+namespace v8 {
+namespace internal {
+
+template<typename Record>
+struct UnboundQueue<Record>::Node: public Malloced {
+  explicit Node(const Record& value)
+      : value(value), next(NULL) {
+  }
+
+  Record value;
+  Node* next;
+};
+
+
+template<typename Record>
+UnboundQueue<Record>::UnboundQueue() {
+  first_ = new Node(Record());
+  divider_ = last_ = reinterpret_cast<AtomicWord>(first_);
+}
+
+
+template<typename Record>
+UnboundQueue<Record>::~UnboundQueue() {
+  while (first_ != NULL) DeleteFirst();
+}
+
+
+template<typename Record>
+void UnboundQueue<Record>::DeleteFirst() {
+  Node* tmp = first_;
+  first_ = tmp->next;
+  delete tmp;
+}
+
+
+template<typename Record>
+void UnboundQueue<Record>::Dequeue(Record* rec) {
+  ASSERT(divider_ != last_);
+  Node* next = reinterpret_cast<Node*>(divider_)->next;
+  *rec = next->value;
+  OS::ReleaseStore(&divider_, reinterpret_cast<AtomicWord>(next));
+}
+
+
+template<typename Record>
+void UnboundQueue<Record>::Enqueue(const Record& rec) {
+  Node*& next = reinterpret_cast<Node*>(last_)->next;
+  next = new Node(rec);
+  OS::ReleaseStore(&last_, reinterpret_cast<AtomicWord>(next));
+  while (first_ != reinterpret_cast<Node*>(divider_)) DeleteFirst();
+}
+
+} }  // namespace v8::internal
+
+#endif  // V8_UNBOUND_QUEUE_INL_H_